Please use this identifier to cite or link to this item: https://doi.org/10.1088/0022-3727/45/18/185102
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dc.titleStrong green emission in ZnO films after H 2 surface treatment
dc.contributor.authorLi, T.
dc.contributor.authorHerng, T.S.
dc.contributor.authorLiang, H.K.
dc.contributor.authorBao, N.N.
dc.contributor.authorChen, T.P.
dc.contributor.authorWong, J.I.
dc.contributor.authorXue, J.M.
dc.contributor.authorDing, J.
dc.date.accessioned2014-10-07T09:54:07Z
dc.date.available2014-10-07T09:54:07Z
dc.date.issued2012-05-09
dc.identifier.citationLi, T., Herng, T.S., Liang, H.K., Bao, N.N., Chen, T.P., Wong, J.I., Xue, J.M., Ding, J. (2012-05-09). Strong green emission in ZnO films after H 2 surface treatment. Journal of Physics D: Applied Physics 45 (18) : -. ScholarBank@NUS Repository. https://doi.org/10.1088/0022-3727/45/18/185102
dc.identifier.issn00223727
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/86728
dc.description.abstractUsing a two-step fabrication technique (pulsed laser deposition (PLD) and H 2 surface treatment), we fabricated ZnO thin films that could emit ultra-strong green emission with coexistence of random lasing phenomenon. After PLD deposition, the as-prepared undoped ZnO thin films (200500nm) were annealed in Ar 95%H 25% ambient at 500°C. The H 2 treatment led to the formation of a porous structure that creates substantial optical cavities (diameter 1.3m). Surprisingly, these optical cavities tremendously amplified the green emission rather than ultraviolet (UV) emission. There was insignificant change in emission intensity after high-temperature annealing (700°C) in O 2 and acetone dipping, indicating the samples are thermally and chemically stable. The samples exhibited a high quantum yield of 32%. We studied the origin of this ultra-strong green emission using low-temperature photoluminescence, extensive structural study and cyclic annealing. The results suggested that neither hydrogen nor V O plays a role in green emission. The green emission was attributed mainly to the complex defects and the presence of structural defects in the porous structure. In addition, we demonstrated the feasibility of large-scale green emission ZnO fabrication via micro-size patterning, paving a way to practical optoelectronic applications. © 2012 IOP Publishing Ltd.
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentNUS NANOSCIENCE & NANOTECH INITIATIVE
dc.contributor.departmentMATERIALS SCIENCE AND ENGINEERING
dc.description.doi10.1088/0022-3727/45/18/185102
dc.description.sourcetitleJournal of Physics D: Applied Physics
dc.description.volume45
dc.description.issue18
dc.description.page-
dc.description.codenJPAPB
dc.identifier.isiut000303537200003
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